name="google-site-verification" content="mD6Rj5zAlx-9XlFL0rxkh0uHoi5H6azi-QnoV70hHEE" />
gtag('set', {'user_id': 'USER_ID'}); // Set the user ID using signed-in user_id. ga('set', 'userId', 'USER_ID'); // Set the user ID using signed-in user_id.